Add two new options:

-W is like -A (number of days in the future to consider, but also
   specifies that we don't want special treatment at weekends.
-F changes our notion of "Friday" (the day before the weekend).

Arguably, calendar(1) is broken to have special treatment of weekends
by default, but this method maintains POLA.

usr.bin/calendar/calendar.1

@@ -56,7 +56,8 @@ utility checks the current directory for a file named
 .Pa calendar
 and displays lines that begin with either today's date
 or tomorrow's.
-On Fridays, events on Friday through Monday are displayed.
+On the day before a weekend (normally Friday), events for the next
+three days are displayed.
 .Pp
 The following options are available:
 .Bl -tag -width Ds
@@ -72,6 +73,14 @@ days (forward, future).
 Print lines from today and the previous
 .Ar num
 days (backward, past).
+.It Fl F
+Specify which day of the week is ``Friday'' (the day before the
+weekend begins).
+.It Fl W Ar num
+Print lines from today and the next
+.Ar num
+days (forward, future).
+Ignore weekends when calculating the number of days.
 .It Fl f Pa calendarfile
 Use
 .Pa calendarfile

usr.bin/calendar/calendar.c

@@ -64,6 +64,7 @@ time_t f_time = 0;
 
 int f_dayAfter = 0; /* days after current date */
 int f_dayBefore = 0; /* days before current date */
+int Friday = 5;	     /* day before weekend */
 
 int
 main(argc, argv)
@@ -74,7 +75,7 @@ main(argc, argv)
 
 	(void) setlocale(LC_ALL, "");
 
-	while ((ch = getopt(argc, argv, "-af:t:A:B:")) != -1)
+	while ((ch = getopt(argc, argv, "-af:t:A:B:F:W:")) != -1)
 		switch (ch) {
 		case '-':		/* backward contemptible */
 		case 'a':
@@ -94,6 +95,10 @@ main(argc, argv)
 			f_time = Mktime (optarg);
 			break;
 
+		case 'W': /* we don't need no steenking Fridays */
+			Friday = -1;
+
+			/* FALLTHROUGH */			
 		case 'A': /* days after current date */
 			f_dayAfter = atoi(optarg);
 			break;
@@ -102,6 +107,10 @@ main(argc, argv)
 			f_dayBefore = atoi(optarg); 
 			break;
 
+		case 'F':
+			Friday = atoi(optarg);
+			break;
+
 		case '?':
 		default:
 			usage();
@@ -137,7 +146,8 @@ void
 usage()
 {
 	(void)fprintf(stderr, 
-		      "usage: calendar [-a] [-A days] [-B days] [-f calendarfile] [-t dd[.mm[.year]]]\n");
+		      "usage: calendar [-a] [-A days] [-W days] [-F friday] [-B days]\n"
+		      "\t[-f calendarfile] [-t dd[.mm[.year]]]\n");
 	exit(1);
 }
 

usr.bin/calendar/calendar.h

@@ -67,6 +67,7 @@ void     setnnames(void);
 
 extern int f_dayAfter; /* days after current date */
 extern int f_dayBefore; /* days bevore current date */
+extern int Friday;	/* day before weekend */
 
 struct fixs {
 	char *name;

usr.bin/calendar/day.c

@@ -150,7 +150,7 @@ settime(now)
 		cumdays = daytab[0];
 	}
 	/* Friday displays Monday's events */
-	offset = tp->tm_wday == 5 ? 3 : 1;
+	offset = tp->tm_wday == Friday ? 3 : 1;
 	header[5].iov_base = dayname;
 
 	oldl = NULL;